OPEN 812L VoIP ATA Router
User Guide
Page 46
OPEN Networks Pty Ltd
www.opennw.com
6.2.3 NAT
Configuration
Network Address Translation (NAT) is a method of connecting multiple computers to the
Internet or any other IP network using one IP address. It operates on the router, usually
connecting two networks together, and translates the private addresses in the internal network
into legal addresses before packets are forwarded onto another network. It can be configured in
such a way that only one address for the entire network to the outside world is exposed so that
the entire internal network can be hidden, thus providing security.
NAT serves three main purposes:
Provides a type of firewall by hiding internal IP addresses
Enables a company to use more internal IP addresses. Since they are used
internally only, there is no possibility of conflict with IP addresses used by
other companies and organizations.
Allows a company to combine multiple ISDN connections into a single Internet
connection.
The NAT module provides Dynamic Network Address (DNS) and Port Translation (Dynamic
NAPT) capability between the LAN and multiple WAN connections. The LAN traffic is routed to
appropriate WAN connections based on the destination IP address and the Route Table. This
eliminates the need for the static NAT session configuration between multiple LAN clients and
multiple WAN connections.
When Dynamic NAT is chosen, there is no need to configure the NAT session and NAT
Session Name Configuration.
Follow the steps below to access and set up your NAT configuration.
Step 1:
To
access
NAT
, click the
Basic
link located at the top-right hand side of the page.
Step 2:
Click
the
NAT
link located on the left menu. The following page appears:
